Experimental signature of topological superconductivity and Majorana zero modes on β-Bi2Pd thin films

被引：86

作者：

Lv, Yan-Feng ^{[1
]}

Wang, Wen-Lin ^{[1
]}

Zhang, Yi-Min ^{[1
]}

Ding, Hao ^{[1
]}

Li, Wei ^{[1
,2
]}

Wang, Lili ^{[1
,2
]}

He, Ke ^{[1
,2
]}

Song, Can-Li ^{[1
,2
]}

Ma, Xu-Cun ^{[1
,2
]}

Xue, Qi-Kun ^{[1
,2
]}

机构：

[1] Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China

[2] Collaborat Innovat Ctr Quantum Matter, Beijing 100084, Peoples R China

来源：

SCIENCE BULLETIN | 2017年 / 62卷 / 12期

基金：

中国国家自然科学基金;

关键词：

Epitaxial beta-Bi2Pd films; Molecular beam epitaxy; Topological superconductivity; Majorana zero modes; Scanning tunneling microscopy; II SUPERCONDUCTOR; VORTEX LINE; FERMIONS; BETA-PDBI2; STATES;

D O I：

10.1016/j.scib.2017.05.008

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The search for Majorana fermions in topological superconductors is one of paramount research targets in physics today. Using a cryogenic scanning tunneling microscopy, we here report the signature of topologically nontrivial superconductivity on a single material of beta-Bi2Pd films grown by molecular beam epitaxy. The superconducting gap associated with spinless odd-parity pairing opens on the surface and appears much larger than the bulk one due to the Dirac-fermion enhanced parity mixing of surface pair potential. Zero bias conductance peaks, probably from Majorana zero modes supported by such superconducting states, are identified at magnetic vortices. The superconductivity exhibits resistance to nonmagnetic defects, characteristic of time-reversal-invariant topological superconductors. Our study reveals beta-Bi2Pd as a prime platform to generate, manipulate and braid Majorana zero modes for quantum computation. (C) 2017 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.

引用

页码：852 / 856

页数：5

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